NRAM_INBHK
ID NRAM_INBHK Reviewed; 466 AA.
AC P16191;
DT 01-APR-1990, integrated into UniProtKB/Swiss-Prot.
DT 01-APR-1990, sequence version 1.
DT 03-AUG-2022, entry version 120.
DE RecName: Full=Neuraminidase {ECO:0000255|HAMAP-Rule:MF_04071};
DE EC=3.2.1.18 {ECO:0000255|HAMAP-Rule:MF_04071};
GN Name=NA {ECO:0000255|HAMAP-Rule:MF_04071};
OS Influenza B virus (strain B/Hong Kong/8/1973).
OC Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC Insthoviricetes; Articulavirales; Orthomyxoviridae; Betainfluenzavirus.
OX NCBI_TaxID=427826;
OH NCBI_TaxID=9606; Homo sapiens (Human).
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX PubMed=1695410; DOI=10.1016/0042-6822(90)90523-t;
RA Air G.M., Laver W.G., Luo M., Stray S.J., Legrone G., Webster R.G.;
RT "Antigenic, sequence, and crystal variation in influenza B neuraminidase.";
RL Virology 177:578-587(1990).
RN [2]
RP REVIEW.
RX PubMed=16192481; DOI=10.1056/nejmra050740;
RA Moscona A.;
RT "Neuraminidase inhibitors for influenza.";
RL N. Engl. J. Med. 353:1363-1373(2005).
CC -!- FUNCTION: Catalyzes the removal of terminal sialic acid residues from
CC viral and cellular glycoconjugates. Cleaves off the terminal sialic
CC acids on the glycosylated HA during virus budding to facilitate virus
CC release. Additionally helps virus spread through the circulation by
CC further removing sialic acids from the cell surface. These cleavages
CC prevent self-aggregation and ensure the efficient spread of the progeny
CC virus from cell to cell. Otherwise, infection would be limited to one
CC round of replication. Described as a receptor-destroying enzyme because
CC it cleaves a terminal sialic acid from the cellular receptors. May
CC facilitate viral invasion of the upper airways by cleaving the sialic
CC acid moieties on the mucin of the airway epithelial cells. Likely to
CC plays a role in the budding process through its association with lipid
CC rafts during intracellular transport. May additionally display a raft-
CC association independent effect on budding. Plays a role in the
CC determination of host range restriction on replication and virulence.
CC Sialidase activity in late endosome/lysosome traffic seems to enhance
CC virus replication. {ECO:0000255|HAMAP-Rule:MF_04071}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=Hydrolysis of alpha-(2->3)-, alpha-(2->6)-, alpha-
CC (2->8)- glycosidic linkages of terminal sialic acid residues in
CC oligosaccharides, glycoproteins, glycolipids, colominic acid and
CC synthetic substrates.; EC=3.2.1.18; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_04071};
CC -!- COFACTOR:
CC Name=Ca(2+); Xref=ChEBI:CHEBI:29108;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_04071};
CC -!- ACTIVITY REGULATION: Inhibited by the neuraminidase inhibitors
CC zanamivir (Relenza) and oseltamivir (Tamiflu). These drugs interfere
CC with the release of progeny virus from infected cells and are effective
CC against all influenza strains. Resistance to neuraminidase inhibitors
CC is quite rare. {ECO:0000255|HAMAP-Rule:MF_04071}.
CC -!- SUBUNIT: Homotetramer. {ECO:0000255|HAMAP-Rule:MF_04071}.
CC -!- SUBCELLULAR LOCATION: Virion membrane {ECO:0000255|HAMAP-
CC Rule:MF_04071}. Host apical cell membrane {ECO:0000255|HAMAP-
CC Rule:MF_04071}; Single-pass type II membrane protein
CC {ECO:0000255|HAMAP-Rule:MF_04071}. Note=Preferentially accumulates at
CC the apical plasma membrane in infected polarized epithelial cells,
CC which is the virus assembly site. Uses lipid rafts for cell surface
CC transport and apical sorting. In the virion, forms a mushroom-shaped
CC spike on the surface of the membrane. {ECO:0000255|HAMAP-
CC Rule:MF_04071}.
CC -!- DOMAIN: Intact N-terminus is essential for virion morphogenesis.
CC Possesses two apical sorting signals, one in the ectodomain, which is
CC likely to be a glycan, and the other in the transmembrane domain. The
CC transmembrane domain also plays a role in lipid raft association.
CC {ECO:0000255|HAMAP-Rule:MF_04071}.
CC -!- PTM: N-glycosylated. {ECO:0000255|HAMAP-Rule:MF_04071}.
CC -!- MISCELLANEOUS: The influenza B genome consist of 8 RNA segments.
CC Genetic variation of hemagglutinin and/or neuraminidase genes results
CC in the emergence of new influenza strains. The mechanism of variation
CC can be the result of point mutations or the result of genetic
CC reassortment between segments of two different strains.
CC -!- SIMILARITY: Belongs to the glycosyl hydrolase 34 family.
CC {ECO:0000255|HAMAP-Rule:MF_04071}.
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DR EMBL; M30631; AAA43729.1; -; Genomic_RNA.
DR PIR; H46347; H46347.
DR SMR; P16191; -.
DR CAZy; GH34; Glycoside Hydrolase Family 34.
DR GO; GO:0020002; C:host cell plasma membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-UniRule.
DR GO; GO:0055036; C:virion membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0052794; F:exo-alpha-(2->3)-sialidase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0052795; F:exo-alpha-(2->6)-sialidase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0052796; F:exo-alpha-(2->8)-sialidase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0005975; P:carbohydrate metabolic process; IEA:InterPro.
DR GO; GO:0046761; P:viral budding from plasma membrane; IEA:UniProtKB-UniRule.
DR CDD; cd15483; Influenza_NA; 1.
DR HAMAP; MF_04071; INFV_NRAM; 1.
DR InterPro; IPR001860; Glyco_hydro_34.
DR InterPro; IPR033654; Sialidase_Influenza_A/B.
DR InterPro; IPR036278; Sialidase_sf.
DR Pfam; PF00064; Neur; 1.
DR SUPFAM; SSF50939; SSF50939; 1.
PE 3: Inferred from homology;
KW Calcium; Disulfide bond; Glycoprotein; Glycosidase; Host cell membrane;
KW Host membrane; Hydrolase; Membrane; Metal-binding; Signal-anchor;
KW Transmembrane; Transmembrane helix; Virion.
FT CHAIN 1..466
FT /note="Neuraminidase"
FT /id="PRO_0000078731"
FT TOPO_DOM 1..8
FT /note="Intravirion"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT TRANSMEM 9..31
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT TOPO_DOM 32..466
FT /note="Virion surface"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT REGION 13..35
FT /note="Involved in apical transport and lipid raft
FT association"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT REGION 38..86
FT /note="Hypervariable stalk region"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT REGION 89..466
FT /note="Head of neuraminidase"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT ACT_SITE 149
FT /note="Proton donor/acceptor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT ACT_SITE 409
FT /note="Nucleophile"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 116
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 150
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 275..276
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 292
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 293
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 324
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT BINDING 374
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 56
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 64
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 144
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT CARBOHYD 284
FT /note="N-linked (GlcNAc...) asparagine; by host"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 87..420
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 122..127
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 182..229
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 231..236
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 277..291
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 279..289
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 318..337
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
FT DISULFID 424..447
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04071"
SQ SEQUENCE 466 AA; 51507 MW; 790D08EB36F10AC3 CRC64;
MLPSTIQTLT LFLTSGGVLL SLYVSASLSY LLYSDILLKF SSTKRTAPTM SLDCANVSNV
QAVNRSATKE MTFLLPEPEW TYPRLSCQGS TFQKALLISP HRFGETRGNS APLIIREPFV
ACGPKECRHF ALTHYAAQPG GYYNGTRKDR NKLRHLISVK LGKIPTVENS IFHMAAWSGS
ACHDGREWTY VGVDGPDSNA LIKIKYGEAY TDTYHSYANN ILRTQESACN CIGGDCYLMI
TDGSASGISK CRFLKIREGR IIKEIFPTGR VEHTEECTCG FASNKTIECA CRDNSYTAKR
PFVKLNVETD TAEIRLMCTE TYLDTPRPDD GSITGPCESN GDKGLGGIKG GFVHQRMASK
IGRWYSRTMS KTERMGMELY VKYDGDPWTD SDALAPSGVM VSMKEPGWYS FGFEIKDKKC
DVPCIGIEMV HDGGKETWHS AATAIYCLMG SGQLLWDTVT GVDMAL
